The white colour of the nose not extending on to the upper lip distinguishes this species from C. petaurista, independently of the general colouring.
Distribution.—West Africa. Although the "Hocheur" is not uncommon in European menageries, it is still uncertain in exactly what part of that extensive region it has its home.
Habits.—Nothing is known of the habits of this species, except what has been observed from examples living in captivity. In durance the species is mild and gentle in disposition, and very active, and has a way of incessantly shaking its head, a habit from which it derives its French appellation of "Hocheur."
XI. THE RED-EARED GUENON. CERCOPITHECUS ERYTHROTIS.
Cercopithecus erythrotis, Waterh., P. Z. S., 1838, p. 59; 1841, p. 71; Martin, Mammif. An., p. 535 (1841); Fraser, Zool. Typ., pl. iv. (1848); Wagn., in Schreb. Säugeth. Suppl., v., p. 49 (1855); Gray, P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 21 (1870); Schlegel, Mus. Pays-Bas, vii., p. 70 (1876); Scl., P. Z. S., 1884, p. 176, 1893, p. 246.
Characters.—General colour of back, sides, and outer aspect of the hind-limbs, black, speckled with yellowish-grey, or with golden-yellow on the hinder part of the back—the hairs being black, ringed with yellow or gold respectively; face nearly nude, except for a few short hairs on the upper part of the nose; region round the eyes, livid blue; nose red; chin white; a black bar from the eye to the ear; below this a broad white whisker-streak on the cheeks, beneath which again there arises from the corner of the mouth and cheeks another black, yellow-ringed, tuft of hair; ears rusty-red internally; external aspect of the fore-limbs blackish; throat, under surface of the body, and inner side of the limbs greyish-white; tail bright rufous, except for a dark line along its upper surface; anal hairs bright red. Length of body, 17 inches; tail, 23 inches.
Distribution.—This rare and very beautiful Monkey has its home in the island of Fernando Po.
XII. THE MOUSTACHED GUENON. CERCOPITHECUS CEPHUS.
Simia cephus, Linn., Syst. Nat., i., p. 39 (1766).
Cercopithecus cephus (Moustac), F. Cuvier, Hist. Nat., Mamm., i., livr. xxvi. (1821); Martin, Mammif. An., p. 532 (1841); Wagner, in Schreber's Säugeth. Suppl., v., p. 49 (1855); Gray, P. Z. S., 1868, p. 182; id., Cat. Monkeys Brit. Mus., p. 20 (1870); Schleg., Mus. Pays-Bas, vii., p. 91 (1876); Scl., P. Z. S., 1893, p. 246.